Carburetor de-icer



March 29, 1955 M. A. GEHNER CARBURETOR DE-ICER Filed Jan. 29, 1952FIG.2.

INVENTOR. MAURICE AGEHNER BY V ATTORNEY.

United States Patent 2,705,135 CARBURETOR DE-ICER Maurice A. Gehner, St.Louis, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., acorporation of Delaware Application January 29, 1952, Serial No. 268,7956 Claims. (Cl. 261-41) This invention relates to carburetors forinternal combustion engines, particularly of the automotive type andconsists in novel means for dislodging ice formations in the vicinity ofthe idle port and throttle valve.

The fuel and air which emerge from the idle port in a carburetor, andwhich pass the partially closed throttle In the accompanying drawingwhich illustrates the invention:

Fig. l is a vertical transverse section of a carburetor embodying theinvention.

Fig. 2 is a similar view showing the lower portion only of thecarburetor, but with the throttle valve in slightly open position.

The carburetor conduit 5 with an air which is mounted a pivotedbutterfly choke valve 7 controlled by any suitable manual or automaticmechanism. In the lower part of the mixture conduit there is a butterflythrottle valve 8, whcih is manually controlled by the usual lever andlinkage parts (not shown), and the lower extremity of the carburetorbarrel is provided with a flange 9 for attachment to the engine intakemanifold.

Adjacent the mixture conduit there is a constant level chamber 10enclosing the usual level controlling float 11. In the lower part of theconstant level chamber is a main metering orifice element 12 throughwhich fuel is supplied to upwardly inclined, main fuel passage 13openough a nozzle 14 into primary venturi tube 15.

fuel is supplied through a metering tube 16 communicating with the mainfuel passage, posterior to orifice element 12,, and idling passages 17and 18 opening through ports 19 and 20 adjacent and posterior to theedge of throttle valve 8 when closed. An idling mixture adjusting screw21 cooperates with lowermost port 20.

A cross passage 22 is provided in the wall of the mixillustrated has adowndraft mixture inlet horn 6 at the upper end in 2,705,135 PatentedMar. 29, 1955 is closed at its outer A small piece of resilient plug 23through port 19 and into the hand wing of throttle valve 8 so as to beshifted thereby, as the throttle valve approaches its closed position,to dislodge any ice which may be formed in or about the port. Of course,port 19 will be constructed to supply the proper quantity of idlingslight space occupied by wire 24.

As the throttle valve is opened, as in Fig. 2, wire 24 returns to itsoriginal configuration by its own resiliency and again sweeps port 19,an advantage, since ice may form or re-form about the port during idlingoperation, due to clearance provided between the edge of the throttledisk and the mixture conduit wall for the supply of air to the engineeven at normal idle position of the throttle.

A spring strip or other shiftable element may be substituted for thewire 24 and the manner of mounting thereof may be varied, as well as theshape and extent of the element.

The invention may be modified in spects as will occur to those skilledin the art, and the exclusive use of all modifications as come withinthe scopel of the appended claims is contemplated.

I c aim:

these and other re- 5. In a carburetor, a mixture conduit, a throttlevalve re1n, an idle port in the wall of said conduit adjacent saidvalve, a plug m the Wall of said conduit adjacent said port, and aspring w re projecting from References Cited in the file of this patentUNITED STATES PATENTS Morse Sept. 13, 1887 Piton Sept. 25, 1900 AltgeltMay 24, 1932 Read June 18, 1946- FOREIGN PATENTS Great Britain Nov. 6,1945

